Here is an account of Pennington's cavalry brigade at Five Forks. I found this in
"New Jersey and the rebellion : a history of the services of the troops and people of New Jersey in aid of the Union cause" on pages 751-752.

Bryce

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The Third Division entered the fight at Dinwiddle Court House
late on the 31st, and decided the action of that day. At daylight
the next morning, Ist of April, Pennington's and Capehart's Bri-
gades, dismounted, began to skirmish for position. Lying close up
to the enemy these brigades marched by the right flank, in single
file, along the enemy's line, until near Five Forks, when the skir-
mishing became very hot. Capeheart's Brigade was drawn out and
mounted, leaving Pennington's alone on foot The latter closed
up directly and formed line just in front of Five Forks, a portion
of the First Division, Fitzhugh's Brigade, on its right, and Custer's
two mounted brigades on the left, lapping the right flank of the
enemy's works. The Fifth Corps was further to the right, beyond
the First Division. Pennington's Brigade unquestionably was the
foriorn hope of that battle. Directly in front of the strongest pomt
of the enemy's huge works covering the Five Forks, the little
brigade advanced, at a given signal, out into the open ground, when
it was met with a terrible, withering fire of masketry and artillery.
too hot for mortal to stand. In vain our men essayed to reach the
works. Our Spencers could not penetrate great logs. Amidst
curses and groans and the yells of the enemy, the baffled brigade
reeled back into the woods, where the rebel shot and shell crashed
among the trees and tore men to atoms. Again the bugle sounded
the charge, and away dashed the brigade. Again was the open field
strewn with its dead. Regiments crumbled up and shrank back
mto the woods. This was slaughter. One-fourth of the brigade
was lying on the ground, dead or dying. The shot and shell "flew
through the woods, even cutting down the trees. In this tempest
of death a young boy attached to Pennington's headquarters rode
gayly along the line with a largo box of cartridges, which he threw
out by handfulls to the men, who seized them as they would have
seized golden coin. This was continued by the little hero until all
were supplied. Once more the bugles sounded. Less confidentlv,
but more angrily and sternly, the brigade advanced into the open
ground, and Spencers and muskets rattled away furiously. •' For-
ward ! Forward !" the bugles rang out unceasingly ; a terrible roar
and yell came from the right as tbe Fifth Corps this time charged
with the cavalry. Sheridan and his flag went over the works, fol-
lowed by Pennington's men and all the rest The day closed on a
great victory, won as much by Pennington's Brigade as by anv
troops engaged.